🚀 go-pugleaf

1.I have read many different and opposing articles on bearings and
cleaning etc. 
Are you supposed to let them run dry or should you use some sort of
lubrication and what sort of lubrication should you use.  I'm mainly
concerned with the wheel bearings for cars and with the attraction of
dirt with lubricants.    

2. Should motor bearings be cleaned any differently and when can you
tell if a motor bearing should be replaced?  

3. Which cause the most damage to a commutator - hard brushes or soft ones?

4. Has anybody tried the hydra drive on a stealth yet? and if so what's
it like?

Thanks in advance

Cheers
Paul